Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,733 questions · 1,794 findings · 326 reviews · Headline outcomes only

No studies found 243 · 13.5%GRADE not reported 96 · 5.4%Very low 597 · 33.3%Low 506 · 28.2%Moderate 303 · 16.9%High 49 · 2.7%

Vitamin A vs no supplementation

Chronic lung disease · promoting growth and development in very low birth weight infants receiving human milk

Supplemental vitamin A showed no clear difference in chronic lung disease (oxygen use at 28 days in survivors) compared with no supplementation (moderate certainty).

2 findings from 1 review

Vitamin A vs no supplementation

Death or chronic lung disease · promoting growth and development in very low birth weight infants receiving human milk

Supplemental vitamin A probably leads to lower death or chronic lung disease (oxygen use at 28 days) compared with no supplementation (moderate certainty).

2 findings from 1 review

Vitamin A vs no supplementation

Death before 36 weeks' postmenstrual age · promoting growth and development in very low birth weight infants receiving human milk

Supplemental vitamin A showed no clear difference in death before 36 weeks' postmenstrual age compared with no supplementation (moderate certainty).

1 finding from 1 review

Vitamin A vs no supplementation

Neurodevelopmental impairment at 18 to 22 months · promoting growth and development in very low birth weight infants receiving human milk

Supplemental vitamin A showed no clear difference in neurodevelopmental impairment at 18 to 22 months compared with no supplementation (low certainty).

1 finding from 1 review

Tibolone vs combined HT

Breast cancer; women without previous breast cancer (all doses) · postmenopausal women with or without vasomotor symptoms

It is very uncertain whether tibolone changes breast cancer; women without previous breast cancer (all doses) compared with combined HT (very low certainty).

1 finding from 1 review

Tibolone vs placebo

Breast cancer; women without previous breast cancer (all doses) · postmenopausal women with or without vasomotor symptoms

It is very uncertain whether tibolone changes breast cancer; women without previous breast cancer (all doses) compared with placebo (very low certainty).

1 finding from 1 review